You open the app, a post from an hour ago has a few more likes than you expected — and for a second there's relief. A small, quiet relief. You know the feeling. And you might even assume that when someone is depressed, they stop reacting to things like this; they go numb. New research shows the opposite.

The mechanism: depression doesn't dull your sensitivity to social reward — it heightens it

A team at Princeton analyzed more than 17 million posts from 7,736 users of the platform X, tracking one simple thing: how much the number of likes on a given day predicts how much a person posts the next day. In other words, how strongly the feedback "drives" them.

The classic assumption is that depression dulls the reward system — that a person stops enjoying what once brought them joy. But here it turned out that people with depression responded to likes more strongly, not less. Social approval drove them more than it did others. And this effect was tied specifically to depression, not to compulsivity or other traits.

It sounds paradoxical until you translate it into the language of need. When your internal resources are low — low energy, low sense of your own worth — every external signal of "you're okay, someone sees you" carries more weight. Not because the person is shallow. Because they're missing what would otherwise come from within.

What the nervous system has to do with it

A like isn't just a number. To the nervous system it's a small signal of social safety — a distant, screen-mediated echo of what co-regulation normally does: the sense that I'm connected to someone and it's safe.

The problem is what kind of co-regulation this is. Thin, unreliable, and intermittent. It comes and it doesn't. And it's precisely unpredictable reward that holds attention most strongly — that's a well-documented principle. So a person who feels low and most needs stable connection can end up attached to a source that, by its very nature, can't provide it. A short relief, then emptiness, then more checking.

This isn't a reason to feel ashamed that likes matter to you. It's a reason to notice what you're actually looking for through that activity. Usually not approval. Connection.

What to take from this

• Notice what you really need. If you catch yourself checking constantly, ask: what do I actually need right now? If the answer is "to know I'm not alone," the app isn't the best tool for that.

• Replace thin co-regulation with something denser. One voice message from someone close, a short meet-up, shared silence in the same room — these settle the nervous system in a way twenty likes can't.

• If you notice this in someone close to you, read their activity on social media as a signal of need rather than vanity.

This article describes a mechanism, not a diagnosis. If you experience persistent low mood, loss of interest, or hopelessness, please reach out to your doctor or a psychologist. Depression is treatable.

References: 

Mirea, D., Chen, S., Ding, J., Palacio-Soto, K., Mildner, J. N., Kelley, S. W., Gillan, C. M., Nook, E. C., & Niv, Y. (2026). The reinforcement effect of social media likes in depression. JAMA Psychiatry.https://doi.org/10.1001/jamapsychiatry.2026.1430